Grommet for pneumatic tires



Apr l', 1930- P. M. BouRDoN 1,753,041

GROMME'I FOR PNEUMATIC TIRES Filed July 25, 1928 nil 1 /l/l//l/l//l/l//l/f/l ////////////W//// Summer fr?? fa/rcel Bourdon www *La Unox-neus.

Patented Apr. 1,193() l UNITEDSTATES' PATENT lCF1-ncl?. i

Hanan MAnCEI. noUnnoN, or rABIs, FRANCE, AssrCNon 'ro MICHELIN Err CIn, or CLERMONT-ramp, FRANCE, A ConronA'rIoN or FRANCE .Gnouxnrron PNEUIIA'IIC TIRES Application tiled July 25, 1928, Serial No. 295,220, and in France August 1, 1987.

Twisted grommetsare already known composed of a core formed of one or more wires surrounded by a layer of wires twisted around said core. l

The' extremities of the wires forming the sheath of the soldered, braze or united in an analogous manner. Such means` of fastening present several disadvantages among which may be 1oA cited the production of seams and irregulari` ties in shape, to say nothing of the over ich the said brazing and soldering operations produce. In addition,v a-

thickness w grommet constructed in such wise is absolutely inextensible.

According tothe `present invention, the vextremities of the wires 'constituting the grommets are connected by means of a sleeve into which the two extremities of the wire are inserted. This method of securing presentsconsiderable advantage over the existin methods of fixation. a

he extremities of the wires 4being inserted in thel sleeve 4"without necessitating screwing or soldering are maintained in the said sleeve simply byreason of the fact that the wires subside at the moment they are inserted in the sleeve/and afterward have a tendency to open along the radius of the grommet withlout having any tendency to contract toward the rear. The sleeve vis adapted to freely and slidably. receive the opposite ends of the Wire and permit the free flexing of the wire inthe expansion-and contraction of the ring smooth sleeveperfectly maintains the wires in place without it being necessary to clamp said wires'. It will thus be obvious that the 46 grommet will become more elastic and that it may be slightly elongated by compressing the wires without jeopardizing the solidity of the fixation means at the extremities thereof.

In addition the facility of construction of the grommets according to the `invention and the reduction of its net cost are considerable. Likewise seams andv irregularities of shape are entirely eliminated;

, so* The accompanying drawing by Waylof tgrommet have usually been formed by the wire. In this manner, av

example, illustrates two embodiments ofmy im roved sleeve.

- Fig.' 3 is a sectional view of a modified 1,*

form of sleeve provided with a central `partition.

Referring to the drawing, arepresents .the grommet whose sheath is composed of a wire spirally wrapped about a core in a manner well known inthe art. The extremities of said'wire are connected by a sleeve b into the opposite ends of which are inserted the extremities of ther wire lwhich are maintained therein `due to the fact that the wire becomes compressed at the time of insertion into 'the sleeve and exerts, subsequently thereto, on the walls of the sleeve 'a pressure in the direction of the radius. The edges of sleeve b are preferably roundedin order to 'facilitate introduction of the extremities of the wire.

Fig. 2 shows a sleeve pierced from end to end and Fig. 3 shows a sleeve whichk is provided on the interior with a middle partition c, destined to prevent the sleeve from sliding completely ofi' the ends of the wire.

' It is to be understood that said partition can have any desired shape 'and may be readily-replaced by a circular throat or other local deformation for preventing the wire from passing clear through.

It is to also be understood that the sleeve can be utilized for connecting the extremities of wires which constitute the sheath of the grommet, for connecting the extremities of the wires which constitute the core, as well as in the case where said core is constituted by circular wires disposed parallel as in the case where the core itself is constituted by spirally wound wires and for other purposes.

'It will thus be understood from the above--v that'the grommet may be made up of an desiredI number of wires and that the en of each wire carry a .sleeve which anchors the ends of the wire together so that the grommet may have a number of these small sleeves in vits construction. .Also,l each wire may comprise a single strand -or be composed of a number of -strands suitably twisted or woven togethen The sleeves are preferably made of brass, f mild steel `or other metals. They are obm tained .by drawing, forging or rolling and analo ous means,

Whlle I have described what I deemto be the preferable form of my invention I do not wish to be limited thereto as theremight u be various changes made in the construction and arrangement o parts without departing from the spirit ofthe invention as complrehended within the scope of the appended c alm. v

,o Having described my invention what I claim asenew and desire to secure by Letters Patent isl -A bead reinforcement for pneumatic tires havin a circularly curvedwire therein with 25 its en s approaching each other, av connecting sleeve (Een at its opposite ends and adapted to eely and -sldably receive the ends of the wire to 'rmit ofthe free Hexing of the wire int e expansion and con- 30 traction of the ring formed b the wire, said sleeve adapted tomaintain t e free'endsof the wire 1n alignment during the relative g movementY of the ends of the wire. `In testimony whereof I: have axed my u signature. e

PIERRE MARCELBOURDON. 

